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27

Sep 22, 2013
09/13

by
A. Gabrielli; T. Baertschiger; M. Joyce; B. Marcos; F. Sylos Labini

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We study the statistics of the force felt by a particle in the class of spatially correlated distribution of identical point-like particles, interacting via a $1/r^2$ pair force (i.e. gravitational or Coulomb), and obtained by randomly perturbing an infinite perfect lattice. In the first part we specify the conditions under which the force on a particle is a well defined stochastic quantity. We then study the small displacements approximation, giving both the limitations of its validity, and,...

Source: http://arxiv.org/abs/cond-mat/0603124v1

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24

Sep 22, 2013
09/13

by
Andrea Comastri; Marcella Brusa; Roberto Gilli

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The shape and the intensity of the 6.4 keV iron line bring unique information on the geometrical and physical properties of the supermassive black hole and the surrounding accreting gas at the very center of Active Galactic Nuclei. While there are convincing evidences of a relativistically broadened iron line in a few nearby bright objects, their properties at larger distances are basically unknown. We have searched for the presence of iron line by fully exploiting Chandra observations in the...

Source: http://arxiv.org/abs/astro-ph/0603139v1

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51

Sep 22, 2013
09/13

by
Daniel Scholz; Michael Weyrauch

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We provide a simple method for the calculation of the terms c_n in the Zassenhaus product $e^{a+b}=e^a e^b \prod_{n=2}^{\infty} e^{c_n}$ for non-commuting a and b. This method has been implemented in a computer program. Furthermore, we formulate a conjecture on how to translate these results into nested commutators. This conjecture was checked up to order n=17 using a computer.

Source: http://arxiv.org/abs/math-ph/0603016v1

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Sep 22, 2013
09/13

by
David Cubero; Jesús Casado-Pascual; Azucena Alvarez; Manuel Morillo; Peter Hänggi

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We investigate a dissipative, deterministic ratchet model in the overdamped regime driven by a {\it rectangular force}. Extensive numerical calculations are presented in a diagram depicting the drift velocity as a function of a wide range of the driving parameter values. We also present some theoretical considerations which explain some features of the mentioned diagram. In particular, we proof the existence of regions in the driving parameter space with bounded particle motion possessing zero...

Source: http://arxiv.org/abs/cond-mat/0603128v1

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86

Sep 22, 2013
09/13

by
Dietrich Stauffer; Xavier Castello; Victor M. Eguiluz; Maxi San Miguel

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The differential equations of Abrams and Strogatz for the competition between two languages are compared with agent-based Monte Carlo simulations for fully connected networks as well as for lattices in one, two and three dimensions, with up to 10^9 agents.

Source: http://arxiv.org/abs/physics/0603042v1

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Sep 23, 2013
09/13

by
E. Arganda; M. J. Herrero

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In this work the following lepton flavor violating $\tau$ and $\mu$ decays are studied: $\tau^- \to \mu^- \mu^- \mu^+$, $\tau^- \to e^- e^- e^+$, $\mu^- \to e^- e^- e^+$, $\tau^- \to \mu^- \gamma$, $\tau^- \to e^- \gamma$ and $\mu^- \to e^- \gamma$. We work in a supersymmetric scenario consisting of the minimal supersymmetric standard model particle content, extended by the addition of three heavy right handed Majorana neutrinos and their supersymmetric partners, and where the generation of...

Source: http://arxiv.org/abs/hep-ph/0510405v3

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29

Sep 22, 2013
09/13

by
E. Carlini; M. V. Catalisano

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In this paper we study existence and uniqueness of rational normal curves in $\PP^n$ passing through $p$ points and intersecting $l$ codimension two linear spaces in $n-1$ points each. If $p+l=n+3$ and the points and the linear spaces are generic, one expects the curve to exist, but this is not always the case. Our main result precisely describes in which cases the curve exists and in which it does not exist.

Source: http://arxiv.org/abs/math/0603137v1

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Sep 22, 2013
09/13

by
G. R. Berdiyorov; M. V. Milošević; F. M. Peeters

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Novel behavior of the critical current density $j_{c}$ of a regularly perforated superconducting film is found, as a function of applied magnetic field $H$. Previously pronounced peaks of $j_{c}$ at matching fields were always found to decrease with increasing $H$. Here we found a {\it reversal of this behavior} for particular geometrical parameters of the antidot lattice and/or temperature. This new phenomenon is due to a strong ``caging'' of interstitial vortices between the pinned ones. We...

Source: http://arxiv.org/abs/cond-mat/0603122v1

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31

Sep 22, 2013
09/13

by
Gabriel Autes; Cyrille Barreteau; Daniel Spanjaard; Marie-Catherine Desjonqueres

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The magnetic properties of iron (spin and orbital magnetic moments, magnetocrystalline anisotropy energy) in various geometries and dimensionalities are investigated by using a parametrized tight-binding model in an $s$, $p$ and $d$ atomic orbital basis set including spin polarization and the effect of spin-orbit coupling. The validity of this model is well established by comparing the results with those obtained by using an ab-initio code. This model is applied to the study of iron in bulk bcc...

Source: http://arxiv.org/abs/cond-mat/0603121v1

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Sep 22, 2013
09/13

by
Gao Xianlong; M. Polini; B. Tanatar; M. P. Tosi

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Interacting two-component Fermi gases loaded in a one-dimensional (1D) lattice and subject to harmonic trapping exhibit intriguing compound phases in which fluid regions coexist with local Mott-insulator and/or band-insulator regions. Motivated by experiments on cold atoms inside disordered optical lattices, we present a theoretical study of the effects of a random potential on these ground-state phases. Within a density-functional scheme we show that disorder has two main effects: (i) it...

Source: http://arxiv.org/abs/cond-mat/0603118v1

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43

Sep 22, 2013
09/13

by
Ginestra Bianconi; Tobias Galla; Matteo Marsili

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We show that the introduction of Tobin taxes in agent-based models of currency markets can lead to a reduction of speculative trading and reduce the magnitude of exchange rate fluctuations at intermediate tax rates. In this regime revenues for the market maker obtained from speculators are maximal. We here focus on Minority Game models of markets, which are accessible by exact techniques from statistical mechanics. Results are supported by computer simulations. Our findings suggest that at...

Source: http://arxiv.org/abs/cond-mat/0603134v1

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Sep 22, 2013
09/13

by
Hannes Raebiger; Maria Ganchenkova; Juhani von Boehm

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The Ga vacancy mediated microstructure evolution of (Ga,Mn)As during growth and post-growth annealing is studied using a multi-scale approach. The migration barriers for the Ga vacancies and substitutional Mn together with their interactions are calculated from first principles, and temporal evolution at temperatures ranging from 200 to 350$^\circ$C is studied using Lattice Kinetic Monte Carlo simulations. We show that at the typical growth and annealing temperatures (i) gallium vacancies...

Source: http://arxiv.org/abs/cond-mat/0603135v1

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60

Sep 22, 2013
09/13

by
Jeremy L. Tinker; David H. Weinberg; Michael S. Warren

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(Abridged) We investigate the power of void statistics to constrain galaxy bias and the amplitude of dark matter fluctuations. We use the halo occupation distribution (HOD) framework to describe the relation between galaxies and dark matter. After choosing HOD parameters that reproduce the mean space density n_gal and projected correlation function w_p measured for galaxy samples with M_r

Source: http://arxiv.org/abs/astro-ph/0603146v1

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Sep 22, 2013
09/13

by
L. Brey; M. J. Calderon; S. Das Sarma; F. Guinea

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A mean field approximation of a model for double perovskites that takes into account the coupling between itinerant electron spins and localized spins is developed. As in previously reported theoretical results, and contrary to experimental observation, the critical temperature is suppressed for large electron density. An effective Heisenberg model reveals the cause of this discrepancy: the competition between degenerate antiferromagnetic and ferromagnetic channels. This degeneracy can be...

Source: http://arxiv.org/abs/cond-mat/0603143v1

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Sep 21, 2013
09/13

by
M. Asorey; A. Kossakowski; G. Marmo; E. C. G. Sudarshan

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The relation between completely positive maps and compound states is investigated in terms of the notion of quantum conditional probability.

Source: http://arxiv.org/abs/quant-ph/0602228v2

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Sep 22, 2013
09/13

by
M. Battaglia; T. Barklow; M. Peskin; Y. Okada; S. Yamashita; P. Zerwas

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This note presents a list of physics processes for benchmarking the performance of proposed ILC detectors. This list gives broad coverage of the required physics capabilities of the ILC experiments and suggests target accuracies to be achieved. A reduced list of reactions, which capture within a very economical set the main challenges put by the ILC physics program, is suggested for the early stage of benchmarking of the detector concepts.

Source: http://arxiv.org/abs/hep-ex/0603010v1

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Sep 22, 2013
09/13

by
M. Buric; T. Grammatikopoulos; J. Madore; G. Zoupanos

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A gravitational field can be defined in terms of a moving frame, which when made noncommutative yields a preferred basis for a differential calculus. It is conjectured that to a linear perturbation of the commutation relations which define the algebra there corresponds a linear perturbation of the gravitational field. This is shown to be true in the case of a perturbation of Minkowski space-time.

Source: http://arxiv.org/abs/hep-th/0603044v1

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Sep 23, 2013
09/13

by
M. Gubinelli

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We establish a representation of a class of solutions of 3d Navier-Stokes equations in $\R^3$ using sums over rooted trees. We study the convergence properties of this series recovering in a simplified manner some results obtained recently by Sinai and other known results for solutions in spaces of pseudo-measures introduced initially by Le Jan and Sznitman. The series representation make sense also in the critical case where there exists global solutions for small initial data and it allows...

Source: http://arxiv.org/abs/math-ph/0511041v2

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47

Sep 22, 2013
09/13

by
M. K. Olsen

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We show that the intracavity Kerr nonlinear coupler is a potential source of bright continuous variable entangled light beams which are tunable and spatially separated. This system may be realised with integrated optics and thus provides a potentially rugged and stable source of bright entangled beams.

Source: http://arxiv.org/abs/quant-ph/0603037v1

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Sep 22, 2013
09/13

by
M. M. Stetsko; V. M. Tkachuk

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We study energy spectrum for hydrogen atom with deformed Heisenberg algebra leading to minimal length. We develop correct perturbation theory free of divergences. It gives a possibility to calculate analytically in the 3D case the corrections to $s$-levels of hydrogen atom caused by the minimal length. Comparing our result with experimental data from precision hydrogen spectroscopy an upper bound for the minimal length is obtained.

Source: http://arxiv.org/abs/quant-ph/0603042v1

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Sep 22, 2013
09/13

by
M. Romero-Gomez; J. J. Masdemont; E. Athanassoula; C. Garcia-Gomez

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We propose a new theory for the formation of rR_1 ring structures, i.e. for ring structures with both an inner and an outer ring, the latter having the form of ``8''. We propose that these rings are formed by material from the stable and unstable invariant manifolds associated with the Lyapunov orbits around the equilibrium points of a barred galaxy. We discuss the shape and velocity structure of the rings thus formed and argue that they are in agreement with the observed properties of rR_1...

Source: http://arxiv.org/abs/astro-ph/0603124v1

994
994

Mar 7, 2006
03/06

by
M. Serdar Kuzuloglu

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Radikal Gazetesi Bilgi Teknolojileri Yazarı M. Serdar Kuzuloğlu tarafından hazırlanan teknoloji programı.

Topic: sanal alem podcast

Source: http://podcastrehberi.com/

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41

Sep 23, 2013
09/13

by
Manuela Campanelli; Bernard J. Kelly; Carlos O. Lousto

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The Lazarus project was designed to make the most of limited 3D binary black-hole simulations, through the identification of perturbations at late times, and subsequent evolution of the Weyl scalar $\Psi_4$ via the Teukolsky formulation. Here we report on new developments, employing the concept of the ``quasi-Kinnersley'' (transverse) frame, valid in the full nonlinear regime, to analyze late-time numerical spacetimes that should differ only slightly from Kerr. This allows us to extract the...

Source: http://arxiv.org/abs/gr-qc/0510122v2

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Mar 4, 2009
03/09

by
Marcos Romao, Ortrun Gutke

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Um programa em portugues e alemao do Quilombo Brasil e da Mamaterra Realizacao de Sonhos Ilimitados de Hamburgo Alemanha ein Programm in Deutsch und Portugiesisch von Quilombo Brasil und Mamaterra Realization unbegraenzter Traeume, Hamburg Deutschland

Topics: Mamaterra, Hamburg

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77

Sep 22, 2013
09/13

by
Maria del Pilar Monsivais-Alonso

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One of the most active areas of physics in the last decades has been that of critical phenomena, and Monte Carlo simulations have played an important role as a guide for the validation and prediction of system properties close to the critical points. The kind of phase transitions occurring for the Betts lattice (lattice constructed removing 1/7 of the sites from the triangular lattice) have been studied before with the Potts model for the values q=3, ferromagnetic and antiferromagnetic regime....

Source: http://arxiv.org/abs/physics/0603035v1

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36

Sep 22, 2013
09/13

by
Martin Hammele; Walter Zimmermann

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The effects of a spatially periodic forcing on an oscillating chemical reaction as described by the Lengyel-Epstein model are investigated. We find a surprising competition between two oscillating patterns, where one is harmonic and the other subharmonic with respect to the spatially periodic forcing. The occurrence of a subharmonic pattern is remarkable as well as its preference up to rather large values of the modulation amplitude. For small modulation amplitudes we derive from the model...

Source: http://arxiv.org/abs/nlin/0603013v1

37,164
37K

Mar 13, 2006
03/06

by
Matisyahu

etree

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disc 1 1. Fire Of Heaven / Altar Of Earth 2. Exhaltation 3. Jerusalem@ 4. Unique Is My Dove 5. Youth 6. Warrior 7. Close My Eyes# 8. Soul Rebel > 9. Beat Box 10. Nigun 11. Dispatch The Troops 12. Chop ' Em Down 13. King Without A Crown 13a. crowd Encore 14. WP > Indestructable > WP ## 15. Heights

favoritefavoritefavorite ( 3 reviews )

Topic: reggae

Source: SBD > Nomad JB3 (@44.1) >

1
1.0

Jul 28, 2019
07/19

by
Michael Wolsey

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This podcast takes on the controlled mainstream media establishment and highlights how most media in America, including TV, cable TV, radio, newsprint, magazines, publishing houses, music, and movies are controlled by a small handful of powerful corporations.

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44

Oct 2, 2014
10/14

by
Microsoft Research

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Project Gustav is a realistic painting-system prototype that enables artists to become immersed in the digital painting experience. The natural interface makes Project Gustav ideal for hobbyists and professional artists alike. Project Gustav achieves a high level of interactivity and realism by leveraging the computing power of modern GPUs, taking full advantage of multitouch and tablet input technology and our novel, natural media-modeling and brush-simulation algorithms. Our prototype...

Topics: Microsoft Research, Microsoft Research Video Archive

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1.0

Nov 23, 2013
11/13

by
Microsoft Research

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Information technology advances are making data collection possible in most if not all fields of science and engineering and beyond. Statistics as a scientific discipline is challenged and enriched by the new opportunities resulted from these high-dimensional data sets. Often data reduction or feature selection is the first step towards solving these massive data problems. However, data reduction through model selection or l 0 constrained optimization leads to combinatorial searches which are...

Topics: Microsoft Research, Microsoft Research Audio MP3 Archive, Jianfeng Gao, Bin Yu

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38

May 3, 2014
05/14

by
Microsoft Research

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favorite 0

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Information technology advances are making data collection possible in most if not all fields of science and engineering and beyond. Statistics as a scientific discipline is challenged and enriched by the new opportunities resulted from these high-dimensional data sets. Often data reduction or feature selection is the first step towards solving these massive data problems. However, data reduction through model selection or l 0 constrained optimization leads to combinatorial searches which are...

Topics: Microsoft Research, Microsoft Research Video Archive, Jianfeng Gao, Bin Yu

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May 3, 2014
05/14

by
Microsoft Research

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Carleton University, Canada / Simula Research Labs, Norway ©2006 Microsoft Corporation. All rights reserved.

Topics: Microsoft Research, Microsoft Research Video Archive, Nachi Nagappan and Tom Ball, Lionel Briand

4
4.0

Nov 23, 2013
11/13

by
Microsoft Research

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Carleton University, Canada / Simula Research Labs, Norway ©2006 Microsoft Corporation. All rights reserved.

Topics: Microsoft Research, Microsoft Research Audio MP3 Archive, Nachi Nagappan and Tom Ball, Lionel Briand

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378

Mar 6, 2006
03/06

by
Mihidea

audio

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58

Mar 24, 2018
03/18

by
Mikaël Pâquet

audio

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Dans cet épisode 00 je vous présente le podcast Moptimise, quel en est la finalité et la fréquence de publication dans vos oreilles.

Topics: Moptimise, podcast

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33

Sep 18, 2013
09/13

by
Miroslav Pardy

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The blackbody is considered in the external general field. The additional coefficients of stimulated emission and absorption are introduced into the Einstein mechanism. Then, the generalized Planck formula is derived. The Einstein and Debye formula for the specific heat is possible to generalize. The application of the theory to the sonoluminescence, the relic radiation and solar spectrum is discussed.

Source: http://arxiv.org/abs/quant-ph/0509081v2

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Sep 22, 2013
09/13

by
Mong Lung Lang

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We determine the normalisers of congruence subgroups of $G_5$.

Source: http://arxiv.org/abs/math/0603129v1

Topics: msnbc.com, NBC, MSNBC, CNBC, NBC Today Show, NBC Nightly News, Dateline

Mário Dias - Edição de 06 Março 2006

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Sep 22, 2013
09/13

by
N. Stojic; N. Binggeli; M. Altarelli

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We report calculations indicating the presence of a surface magnetic moment for Rh(001), motivated by the detection of a finite moment by magnetic linear dichroism experiments. We show that, while the density functional with the local density or generalized gradient approximations (LDA and GGA) for exchange and correlation yields a non-magnetic ground state, the application of the GGA plus on-site Coulomb interaction U method predicts surface magnetism, thus offering a solution to the...

Source: http://arxiv.org/abs/cond-mat/0603127v1

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8.0

Aug 6, 2019
08/19

by
Peter Sculthorpe; Alun Hoddinott; Boris Blacher; Malcolm Arnold; Benjamin Britten

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Tracklist: 1. Sun Music (I), for Orch. - Peter Sculthorpe 2. Folk Song Suite, for Orch. - Alun Hoddinott 3. Violin Concerto - Boris Blacher 4. Concerto for 2 Violins and Strings - Malcolm Arnold 5. "Voices For Today" for Choir, Children's Choir and Organ - Benjamin Britten

Source: CD

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22

Sep 22, 2013
09/13

by
S. Van Loo; M. C. Runacres; R. Blomme

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We present a model for the non-thermal radio emission from presumably single O stars, in terms of synchrotron emission from relativistic electrons accelerated in wind-embedded shocks. These shocks are associated with an unstable, chaotic wind. The main improvement with respect to earlier models is the inclusion of the radial dependence of the shock velocity jump and compression ratio, based on 1D hydrodynamical simulations. The decrease of the velocity jump and the compression ratio as a...

Source: http://arxiv.org/abs/astro-ph/0603127v1

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28

Sep 22, 2013
09/13

by
Siddharth Ray; Michelle Effros; Muriel Medard; Ralf Koetter; Tracey Ho; David Karger; Jinane Abounadi

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We examine the issue of separation and code design for networks that operate over finite fields. We demonstrate that source-channel (or source-network) separation holds for several canonical network examples like the noisy multiple access channel and the erasure degraded broadcast channel, when the whole network operates over a common finite field. This robustness of separation is predicated on the fact that noise and inputs are independent, and we examine the failure of separation when noise...

Source: http://arxiv.org/abs/cs/0603022v1

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21

Sep 22, 2013
09/13

by
T. Tony Cai; Mark G. Low

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Estimation of a quadratic functional over parameter spaces that are not quadratically convex is considered. It is shown, in contrast to the theory for quadratically convex parameter spaces, that optimal quadratic rules are often rate suboptimal. In such cases minimax rate optimal procedures are constructed based on local thresholding. These nonquadratic procedures are sometimes fully efficient even when optimal quadratic rules have slow rates of convergence. Moreover, it is shown that when...

Source: http://arxiv.org/abs/math/0603134v1

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Sep 22, 2013
09/13

by
Tristan L. Smith; Elena Pierpaoli; Marc Kamionkowski

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Primordial gravitational waves (GWs) with frequencies > 10^{-15} Hz contribute to the radiation density of the Universe at the time of decoupling of the cosmic microwave background (CMB). The effects of this GW background on the CMB and matter power spectra are identical to those due to massless neutrinos, unless the initial density-perturbation amplitude for the gravitational-wave gas is non-adiabatic, as may occur if such GWs are produced during inflation or some post-inflation phase...

Source: http://arxiv.org/abs/astro-ph/0603144v1

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20

Sep 22, 2013
09/13

by
Y. M. Cho; D. G. Pak; M. L. Walker

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The effects of light propagation in constant magnetic and electric backgrounds are considered in the framework of the effective action approach. We use the exact analytic series representation for the one-loop effective action of QED and apply it to the birefringence effect. Analytical results for the light velocity modes are obtained for weak and strong field regime. We present asymptotic formulae for the light velocity modes for the ultra strong magnetic field which can be realized in some...

Source: http://arxiv.org/abs/hep-th/0603031v1

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Sep 21, 2013
09/13

by
Young L. Kim; Prabhakar Pradhan; Hariharan Subramanian; Yang Liu; Min H. Kim; Vadim Backman

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We exploit low spatial coherence illumination to dephase time-reversed partial waves outside its finite coherence area, which virtually creates a controllable coherence volume and isolates the minimal number of scattering events from higher order scattering in enhanced backscattering (EBS, also known as coherent backscattering) of light. We report the first experimental evidence that the minimum number of scattering events in EBS is double scattering in discrete random media, which has been...

Source: http://arxiv.org/abs/cond-mat/0508591v3